Coating processes – Nonuniform coating – Metal – glass – or ceramic base
Patent
1984-01-11
1985-08-06
Morgenstern, Norman
Coating processes
Nonuniform coating
Metal, glass, or ceramic base
106 19, 106 383, 4273762, 4273765, 427403, 4274192, 4274193, B05D 500
Patent
active
045335737
ABSTRACT:
A composition is provided for use as an anti-scaling coating or to produce legible markings on metal products. The composition includes solids of from about 30 to 50 parts by weight of an opacifying pigment, from about 43 to 58 parts by weight of a water soluble alkali metal silicate binder, at least 50 percent of the alkali metal silicate being sodium silicate, the alkali metal silicate having a ratio of silicate to alkali metal oxide of from about 2.60 to 3.25, sufficient cross-linking binder to provide from about 1.5 to 5.0 parts B.sub.2 O.sub.3, the ratio of total pigment to total binder being within the range of 0.50 to 1.0, and sufficient water to give the composition a viscosity of about 800 to 5000 centipoise. The composition adheres when applied to metal products which are at temperatures of at least 250.degree. F. or which are subsequently heated to such temperatures so as to bake the coating. The preferred method of making the composition includes providing first and second soluble alkali metal silicate solutions, preferably soluble sodium silicate solutions having silicate ratios of about 2.0 to 2.8 and 3.0 to 3.9, respectively. The two starting solutions are mixed to form a third solution. The cross-linking binder material is added to one of the solutions prior to addition of the other solid materials or to the combined silicate solutions. Finally, the other solids and water as needed are added to provide the above-mentioned composition. Utilizing the two diverse starting solutions provides a final mixture having a lower viscosity than when a single soluble silicate starting solution of equivalent SiO.sub.2 ratio is used. Thus, the water content of the composition may be substantially reduced without increasing the viscosity, thus enabling application of the composition to metal products that are at higher temperatures without flaking of the material from the metal surfaces upon subsequent cooling.
REFERENCES:
patent: 3640737 (1972-02-01), Lankard et al.
patent: 3732115 (1973-05-01), Lankard et al.
patent: 4036655 (1977-07-01), Yamada et al.
patent: 4169735 (1979-10-01), Boberski et al.
Bell Janyce A.
Morgenstern Norman
Riesmeyer William F.
United States Steel Corporation
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